Hydrophilic Branched Carbohydrate Polymer Paper Substrate for Protein Preservation
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Solution Overview
Problem
Current paper substrates for biological sample preservation, particularly for protein analysis, face challenges in maintaining the integrity and recoverability of sensitive proteins during drying and storage, as they are prone to denaturation and interference from chemical additives.
Innovation Solution
A paper substrate incorporating cellulose or glass fibers with a hydrophilic branched carbohydrate polymer, such as dextran or Ficoll, which provides protective effects, maintains protein activity, and ensures homogeneous sample spots, facilitating high recovery of biologically active proteins after drying and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plain untreated cellulose papers are used for preservation of blood samples, then the substrate provides satisfactory mechanical properties and is suitable for protein analysis, but the analytical recoveries and biological activities of sensitive proteins are not desirable
Solution Approach 1:
The patent introduces an intermediary substance (protective coating composition containing sugars, polyols, or amino acids) that mediates between the paper substrate and the protein analyte. This coating acts as a protective layer that prevents direct interaction between the protein and potentially harmful paper components while maintaining the paper's mechanical properties and protein binding capacity.
2Reliability
If chemical additives are added to stabilize proteins in paper substrates, then protein stability is improved, but masking effects occur that affect analytical techniques such as mass spectroscopy and immunoassays
Solution Approach 1:
The patent changes the chemical parameters of the protective coating by selecting specific substances (sugars like sucrose and trehalose, polyols like glycerol and sorbitol, or amino acids like proline and cysteine) that provide protein stabilization through different mechanisms (osmoprotection, glass formation, or radical scavenging) without introducing masking effects that would interfere with analytical detection.
3Productivity
If the paper substrate absorbs liquid samples quickly, then efficient sample processing is achieved, but homogeneous circular sample spots are not always obtained
Solution Approach 1:
The patent applies the protective coating composition to the paper substrate before sample application. This preliminary action creates a pre-formed protective layer that controls sample absorption and distribution, ensuring that liquid samples form homogeneous circular spots while being efficiently absorbed into the paper matrix for subsequent processing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The substrate achieves high recovery rates of biologically active proteins, maintains protein integrity during storage, and allows for efficient extraction, making it suitable for both analytical and therapeutic applications.
Implementation Method 1
a paper useful as a sample application substrate for preservation of biological samples... comprising cellulose fibres and/or glass fibres, and 4-30 wt % of a hydrophilic or water soluble branched carbohydrate polymer
Implementation Method 2
providing a high recovery of biologically active proteins after drying and storage... maintains protein integrity during storage
Implementation Method 3
after drying and storage... providing a high recovery of biologically active proteins after drying and storage
Data Source
AI summary
The invention discloses a cellulose or glass fiber paper for preservation of biological samples, which comprises 4-30 wt % of a hydrophilic branched carbohydrate polymer. It also discloses a method for preservation of biological samples by applying and drying them on the paper.